单项选择题

A．Successful business practices.
B．Famous inventors.
C．Public health concerns.
D．Unsuccessful inventions.
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S1. The reason why many production processes were taken over by the marketplace was that _____.
单项选择题
A．Your eyesight.B．Your driving ability.C．The mechanical condition of your car.D．Your knowledge of traffic regulations.
A．Your eyesight.
B．Your driving ability.
C．The mechanical condition of your car.
D．Your knowledge of traffic regulations.
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